Three things come to mind:
1. You wrote that you liked the most recent strata manager. In your shoes I would try to hunt him down. If he has moved to another agency and is still a strata manager, he may be able to guide you. Guide you in terminating the contract and perhaps offering to take you as a client;
2. If the contract spells out how you can terminate without penalty and you do so in the time allowed, then you should be on safe ground to exit. If the current strata manager contacts you querying why you want to cancel tell him your grievances. He may then act appropriately and address your concerns. If he starts to act in your interest about fixing defects, you may want to give him a 1 year contract; and
3. Having found the only way to get satisfaction from non performing strata managers is to complain to Fair Trading, I suggest you complain online about the agent not doing his job, see
https://www.fairtrading.nsw.gov.au/help-centre/online-tools/make-a-complaint
scroll to
real estate, property management and strata
click on
complaint form
and fill it in.
There is no cost and FT will look into the matter.
As you have no idea what will happen with the former and current strata managers, I would file the complaint ASAP. It’ll take time for FT to get to it and of course you can always withdraw it if matters settle down to your satisfaction.